U0236 Diagnostic Trouble Code

U0236 is a kind of OBD-II Diagnostic U-Network Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a U0236 diagnostic trouble code may include:

Faulty O2 Sensor
Lack of power
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly

Possible Causes :

Defective ECU strategies or components will prevent proper regeneration
The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed.

Process Tips

Diagnostic trouble code U0236 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before U0236.

Fortunately, U0236 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0236 Trouble Code For Specific Cars

U0236 Mercury Grand Air Suspension LR Corner Down Timeout
U0236 Volkswagen Touran I SCP (J1850) Invalid or Missing Data for Audible Warnings
U0236 Lanchester 40 Speed Fuel Pump Positive Feed Fault
U0236 Leblanc Caroline TCM Communication Circuit
U0236 Bugatti Type 251 Cylinder 1 Injector Circuit Low
U0236 Fiat Panda Lamp Turn Signal Rear Output Circuit Short To Ground
U0236 Alvis Ta14 Air Mixture Solenoid Circuit Malfunction